Update README.md

Author: Rdornier

README.md

@@ -2,6 +2,11 @@
 
 This repo adds some tools developed at the BIOP to ease scripting and assist user project in Qupath
 
+> [!WARNING]
+> Versions from v3.3.0 or above of this extension **will only work on QuPath 0.6.0 or later**. Please update QuPath to the latest version. 
+> In case you are stuck with QuPath v0.5.1, [the last release to work is v3.2.0](https://github.com/BIOP/qupath-extension-biop/releases/tag/v3.2.0)
+
+
 ## Installing
 
 Download the latest `qupath-extension-biop-[version].jar` file
@@ -10,4 +15,4 @@ from [releases](https://github.com/biop/qupath-extension-biop/releases) and drag
 If you haven't installed any extensions before, you'll be prompted to select a QuPath user directory. The extension will
 then be copied to a location inside that directory.
 
-You might then need to restart QuPath (but not your computer).
+You might then need to restart QuPath (but not your computer).